Received a new RF-602 kit today, and discovered they have made some changes. Yongnuo have replaced the RF-602TX Transmitter with the RF-600TX. They state they have 'revised' it to 'work better with TTL to create a more power system'. To accomplish this.. strangely.. they have ditched the PC-Sync port on the trigger and put a plug in place.
New trigger on left, original 602TX trigger on right.
Externally, besides the 'plastic plug' replacing the PC-Sync port, there is also new screen printing to say "RF-600TX" as well as on the reverse it now has printing to remind you of the "ALL" channel coding (all dips on).They also come with a more modernised manual that also details the accessories available on the back.
The cynic in me would suggest that the removal of the PC-Sync Port is more to coincide with the release of the AS-20 PC-Sync Hotshoe Adapter. As I had to make the mod with the capacitor to make it Pentax friendly @ 1/180, I opened it up to see.
Low and behold - there is the drill holes and pads for the PC-Sync port still on the board including the solder pads and screen print. Shorting them out also does cause the trigger to fire. Hmmm....
So for those that buy the 602's (and why not, they are cheap, and work to 1/180 with a minor mod, and are good to 100m's), and if you really want a sync port on the trigger - you can just attach one. The plastic plug removes easily enough, and its a simply matter to solder the wires in place like in the original 602TX's.
Besides this - the units are identical to the previous 602TX's. After modification, they also shoot quite nicely @ 1/180. All of these shots where taken using two flashes and one of my earlier modded Nikon triggers (an RF-602TX). All the other mods will work unchanged as well as they are the same as before internally and in operation.
(Strobist Info: 1 x Achiever TZ250 on Full Power (Manual) and Rosco full CTO Gel through an umbrella directly over the working area camera left rear; 1 x Sigma DF-500 DG Super at 1/4 zoomed to 50mm with a reflective top bounce card and Rosco full CTO Gel at immediate camrea right.)